Determination of acidic centers on supported Mo2C catalysts

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The acidic properties of both HZSM-5 and SiO2 supported MoO 3 and carburized MoO3 have been investigated by FTIR spectroscopy. Deposition of Mo caused the consumption of Brønsted acidic OH groups of HZSM-5 as shown by the changes in the ν(OH) region of the spectra and also by pyridine and low temperature CO adsorption measurements. Carburization of the sample did not result in regeneration of acidic OH groups of the zeolite. Mo reacted with OH groups during its deposition on SiO 2. The results of both pyridine and CO adsorption measurements did not indicate the generation of Brønsted acidic sites on MoO 3/SiO2 and carburized MoO3/SiO2. Lewis acid sites are formed, however, upon the deposition of Mo. Carburization led to stronger Lewis centers, which are probably the active sites - together with the carbide phase - in methane aromatization on MoO3/SiO 2.

Original languageEnglish
Pages (from-to)35-40
Number of pages6
JournalJournal of Molecular Catalysis A: Chemical
Volume207
Issue number1
DOIs
Publication statusPublished - Jan 2 2004

Fingerprint

Catalyst supports
Carbon Monoxide
catalysts
Pyridine
pyridines
Aromatization
Zeolites
Adsorption
Lewis Acids
adsorption
Methane
regeneration
carbides
Carbides
methane
Spectroscopy
acids
Acids
spectroscopy
molybdenum trioxide

Keywords

  • Brønsted and Lewis acidic centers
  • FTIR spectroscopy
  • Methane aromatization
  • Molybdenum carbide
  • Pyridine and CO adsorption

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Determination of acidic centers on supported Mo2C catalysts. / Óvári, László; Solymosi, Frigyes.

In: Journal of Molecular Catalysis A: Chemical, Vol. 207, No. 1, 02.01.2004, p. 35-40.

Research output: Contribution to journalArticle

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N2 - The acidic properties of both HZSM-5 and SiO2 supported MoO 3 and carburized MoO3 have been investigated by FTIR spectroscopy. Deposition of Mo caused the consumption of Brønsted acidic OH groups of HZSM-5 as shown by the changes in the ν(OH) region of the spectra and also by pyridine and low temperature CO adsorption measurements. Carburization of the sample did not result in regeneration of acidic OH groups of the zeolite. Mo reacted with OH groups during its deposition on SiO 2. The results of both pyridine and CO adsorption measurements did not indicate the generation of Brønsted acidic sites on MoO 3/SiO2 and carburized MoO3/SiO2. Lewis acid sites are formed, however, upon the deposition of Mo. Carburization led to stronger Lewis centers, which are probably the active sites - together with the carbide phase - in methane aromatization on MoO3/SiO 2.

AB - The acidic properties of both HZSM-5 and SiO2 supported MoO 3 and carburized MoO3 have been investigated by FTIR spectroscopy. Deposition of Mo caused the consumption of Brønsted acidic OH groups of HZSM-5 as shown by the changes in the ν(OH) region of the spectra and also by pyridine and low temperature CO adsorption measurements. Carburization of the sample did not result in regeneration of acidic OH groups of the zeolite. Mo reacted with OH groups during its deposition on SiO 2. The results of both pyridine and CO adsorption measurements did not indicate the generation of Brønsted acidic sites on MoO 3/SiO2 and carburized MoO3/SiO2. Lewis acid sites are formed, however, upon the deposition of Mo. Carburization led to stronger Lewis centers, which are probably the active sites - together with the carbide phase - in methane aromatization on MoO3/SiO 2.

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